与 SQL 相关的计数记录查询 [关闭]

Question

我有一个反馈表，我从客户那里得到反馈。他的桌子是这样的

ID  Service      Food      Behavior  Environment   OverallExprience  Flight    Date

1   Excellent   VeryGood    Good     Bad            Poor             EK0603  2018-03-29 
2   Excellent   Good      VeryGood   Excellent      Poor             EK0603  2018-03-29 

我想从员工那里得到的只是搜索日期（从 ---> 到）并得到一份简短的报告，其中包括

• 优秀人数
• 数量非常好
• 好数量
• 坏数
• 可怜的

对于所有给定的选项。 如果员工选择了 2018-03-29 到 2018-03-29

的日期范围，则与给定的数据一样

所以他可以看到这样的记录

              Excellent        Very Good    Good     Bad     poor
Service         2                 0           0       0        0

Food            0                 1           1       0        0

Behavior        0                 1           1       0        0

Environment     1                 0           0       1        0

卡在这里需要帮助。如果答案在 LINQ 查询中，那将是显而易见的

Answer 1

因为您想将列转置为行，所以我想您需要几个 UNION。 您可能需要对每个“类别”进行不同的查询，并且对于每个类别，您应该计算每个选项获得多少票。

请试试这个查询，它应该可以做到：

SELECT MAX('Service') AS Category,
       COUNT(CASE WHEN t.Servive = 'Excellent' THEN 1 END) AS Excellent,
       COUNT(CASE WHEN t.Servive = 'VeryGood' THEN 1 END) AS Very_Good,
       COUNT(CASE WHEN t.Servive = 'Good' THEN 1 END) AS Good,
       COUNT(CASE WHEN t.Servive = 'Bad' THEN 1 END) AS Bad,
       COUNT(CASE WHEN t.Servive = 'Poor' THEN 1 END) AS Poor
  FROM table1 t
 WHERE t.Date BETWEEN '2018-03-29' AND '2018-03-29'
UNION
SELECT MAX('Food') AS Category,
       COUNT(CASE WHEN t.Food = 'Excellent' THEN 1 END) AS Excellent,
       COUNT(CASE WHEN t.Food = 'VeryGood' THEN 1 END) AS Very_Good,
       COUNT(CASE WHEN t.Food = 'Good' THEN 1 END) AS Good,
       COUNT(CASE WHEN t.Food = 'Bad' THEN 1 END) AS Bad,
       COUNT(CASE WHEN t.Food = 'Poor' THEN 1 END) AS Poor
  FROM table1 t
 WHERE t.Date BETWEEN '2018-03-29' AND '2018-03-29'
UNION
SELECT MAX('Behavior') AS Category,
       COUNT(CASE WHEN t.Behavior = 'Excellent' THEN 1 END) AS Excellent,
       COUNT(CASE WHEN t.Behavior = 'VeryGood' THEN 1 END) AS Very_Good,
       COUNT(CASE WHEN t.Behavior = 'Good' THEN 1 END) AS Good,
       COUNT(CASE WHEN t.Behavior = 'Bad' THEN 1 END) AS Bad,
       COUNT(CASE WHEN t.Behavior = 'Poor' THEN 1 END) AS Poor
  FROM table1 t
 WHERE t.Date BETWEEN '2018-03-29' AND '2018-03-29'
UNION
SELECT MAX('Environment') AS Category,
       COUNT(CASE WHEN t.Environment = 'Excellent' THEN 1 END) AS Excellent,
       COUNT(CASE WHEN t.Environment = 'VeryGood' THEN 1 END) AS Very_Good,
       COUNT(CASE WHEN t.Environment = 'Good' THEN 1 END) AS Good,
       COUNT(CASE WHEN t.Environment = 'Bad' THEN 1 END) AS Bad,
       COUNT(CASE WHEN t.Environment = 'Poor' THEN 1 END) AS Poor
  FROM table1 t
 WHERE t.Date BETWEEN '2018-03-29' AND '2018-03-29'